The PN512 is a highly integrated contactless read-write chip that integrates various active/passive contactless communication methods and protocols at 13.56 MHz.
The PN512 transmission module supports 4 different operating modes:
1. Reader mode supports ISO 14443A / MIFARE® and FeliCa mechanisms
2, the reader mode supports ISO 14443B mechanism
3, card operation mode, support ISO 14443A / MIFARE® and FeliCa mechanism
4, NFCIP-1 mode
Highly integrated analog circuit, demodulation and decoding response
Output Buffer Drivers Connect Antennas with a Small Number of External Passive Components
Integrated RF field detector
Integrated data pattern detector
Supports ISO 14443A / MIFARE®
Support ISO 14443B read/write
Typical operating distance exceeds 50mm in reader/writer mode, depending on antenna size, tuning and power
Working distance up to 50mm in NFCIP-1 mode, depending on antenna size, tuning and power supply
Typical operating distance in the card operating mode is approximately 100mm, depending on antenna size, tuning and external field strength
Supports MIFARE® Classic encryption in reader/writer mode
Supports higher transmission rate communication for ISO 14443A: 212kbit/s and 424kbit/s
Supports communication baud rates of 212kbit/s and 424kbit/s in FeliCa mode
Support S2C interface
Integrated NFCIP-1 RF interface with up to 424kbit/s transfer rate
Support host interface:
-SPI interface up to 10 Mbit/s
- I2C interface, 400 kbit/s in fast mode and 3400 kbit/s in high speed mode
- Serial UARTs with different transmission rates, up to 1228.8 kbit/s, depending on the RS232 interface, the voltage level of the interface depends on the power supply of the port
8-bit parallel interface with or without address latch enable
Ample 64-byte transmit and receive FIFO buffers
Flexible interrupt mode
Hardware Reset with Low Power Consumption
Software power-down mode
Programmable timer
Internal Oscillator Connects 27.12MHz Quartz Crystal
2.5V~3.6V power supply
CRC coprocessor
Free programmable I/O pins
Internal self test
NFC drive circuit for PN512
Recently, NXP's PN512 chip has been used to develop multi-function readers that can operate ISO14443A, ISO14443B, and FELICA. To implement card operations with different protocols, it is important to correctly set the 64 registers of the PN512. In order to use the serial port to observe the register setting of the PN512 through a PC, a small program was specifically made to read the contents of all 64 registers of the PN512, send it to the PC through the serial port, and display it on the screen of the PC in ASCII code. The program code is as follows:
Void SendReg(void)
{
Unsigned char i,j,k;
SendStr("Reg 0 1 2 3 4 5 6 7 8 9 ABCDEF");
For(i=0;i<<4;i++)
{
SendStr("Page");SendChar('0'+i);SendChar(' ');
For(j=0;j<<16;j++)
{
k=RcGetReg(i*16+j);
SendChar((k)" 4)(((k)" 4)") '7': '0'));
SendChar((k&0x0f)+(((k&0x0f)" 9)? '7': '0'));
SendChar(' ');
}
SendStr("");
}
}
SendStr() sends a string and SendChar() sends a single character. The following is the display effect on the HyperTerminal:
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